Francis james drake



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MACHINE FOR SEARPENING sAWs. No. 472,865. PatentedApr. 12, 1892.

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UNIT-ED Y STATES PATENT OFFICE.

FRANCIS JAMES DRAKE, OF BELLEVILLE, CANADA.

MACHINE FoR SHARPENING 'sAws.

SPECIFICATION forming part of Letters Patent No. 472,865, dated April 12, 1892.

Application tiled November 5, 1891. Serial No. 410,925. (No model.)

To a/ZZ whom t may concern:

Be it known that l, FRANCIS JAMES DRAKE, a subject of the Queen of Great Britain, and a resident'of Belleville, in the Province of Ontario and Dominion of Canada,have invented certain new and useful Improvements in Hachines for Sharpening and Gumming Saws; andI do hereby declare that the following is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to improvements in machines for sharpening and gumming saws, whereby I attain superior results with respect to economy andsimplicity in construction and efficiency in operation.

Among other objects my invention contemplates the provision of improved means vfor adjustably holding the saw to be sharpened or gummed so that the teeth thereof may be presented at different angles to the cutting or grinding disk, according to the description or character of the saw; also, the provision of improved means for automatically and successively presenting a new tooth to the grinding-disk by the act of elevating the disk to throw it out of engagement with a preceding tooth which has been sharpened. There are also other objects and advantages to be attained which will be apparent to those skilled in the art and need not be enumerated here'.

The invention consists in the novel construction and combination of parts hereinafter described claimed.

In the accompanying drawings, Figure 1 is a front elevation of a saw sharpening and gumming machine constructed in accordance with my invention. Fig. 2 is a side elevation of the same. Fig. 3 is a det-ail sectional view of the saw-holding cone.

In the said drawings the reference-numeral 1 denotes the base of the machine, consisting of a series of legsadapted to be secured to a floor, radiating from a central hub having an aperture through which passes a vertical shaft 2, securely held therein by means of a set-screw 3. To the upper end of this shaft is secured a rearwardly-proj ecting bifurcated frame 4, having bearings 5, in which is jour.

naled a shaft 6, carrying driving-pulley 7. Pivoted or journaled on this shaft is the frame 8, which carries the emery or other grinding wheel or disk.y The shaft 9, upon which said wheel is mounted, is journaled in bearings 10 in the forward part of the pivoted frame and is provided with a small disk 12, between which the said emery wheel is clamped by means of the nut 13. Upon the shaft 9 is xed a pulley 14, connected by means of a belt l5 with a pulley 16 on the shaft 6. The frame8is provided with ahandle 17, by which its front end may be depressed to throw the grinding-disk into engagement with the saw-teeth. The frame 4 at its front end is provided with two laterally-proj ectingv'lugs 18, through which pass setscrews 19, which limit the downward movement of the frame 8. Intermediate of its ends said frame is also provided with a downwardly-depending arm 20, in which is pivoted a lever 21, provided at one end with a weight 22, while its other end is connected' by a rod or bar 23 with the frame 8, so that when the handle 17 is released the weight will elevate the frame 8 and throw the grinding-disk out of engagement with the saw-tooth.

Journaled upon the shaft 2 near its upper end is a rotatable hub 24, having a set-screw 25 and provided with a projecting arm 26, to which is pivoted a gate 27, consisting of the inclined bars 28, havingrecesses 29 and slots 30. At their lower ends these bars are connected together by means of the curved arm 31, also provided with recesses 29 and slots 30, similar to the bars 28. By preference these parts are all made integral or in a single piece.

The numeral 31 denotes a cup-shaped hub having a central aperture and a boss 32, which latter is seated in the recess in bar 28 and is vertically movable therein. Passing through the aperture in the hub is a spindle 33, having a collar or annular flange 34 and a screw-threaded end 35, a screw-threaded end 36, and an intermediate plainportion 37, upon which fits a .cone 38. Y

The numerals 39 and 40 designate tail-nuts fitting on the spindle 33.

Connected with the bars 28 is a horizontal plate 41, having a series of elongated slots 42, through which pass headed screws 43 and which also pass Athrough the slots 30 in said IOO bars aud are provided with nuts 44, whereby said plate is capable of vertical adj ustment. Pivoted to this plate are two cogged segments 45 and 46, which intermesh with each other. One of these segments 45 is provided with links 47, having a series of apertures 48, by which they are adj ustably connected by means of a piu 49 with a downwardly-depending arm 50, also provided with a series ofy a-pertures 5l, connected with the pivoted frame 8. The plate 4l is also provided at its upper and lowersides with two forwardly-projecting lugs 52, provided with adjustable screws 53,'by which the movement of said segment is limited. The segment 46 is provided with anaperture at its outer end, through which passes. a bar 54, which is adjustable verti-` cally, a set-screw 55 being provided to hold itv screw 58.: This hub is provided with an ear 59, through which passesV a headed-screwfbolt 60.l rIhis boltv also passes throughthe slot in the arm 3l and is provided with a nut 6l.

The numeral. 62 designates a bracket counected-with the arm 26, and i`s provided with a. set-screw 63, adapted to bearagainst and steady the saws. t

T-heloperation is as follows: The tail-n ut 40 is'unscrewed and the cone 3S removed and passed through the central apertureiuthe sawto be sharpened. The cone and saw are then placedupon the spindle 33 and the tailnutfapplied to holdvthe saw between the hub Eiland the cone. The tail-nut 39 -is now loosened and the hubl adjusted so asto Ybring the sawlto the proper height to -haveitsfteeth engagewith the grinding-disk. The tail-nut is then tightened'to securely hold the hub and saw intheir adjusted position.A Itwill thus be seen that saws of varying diameters `can be readily adjusted vertically, so-as to engagek with the grinding-disk.- The bar 54 is then adjusted so that thepawl 56 will engage one of the teeth of the` sawv justy inrear ofthe tooth in line with the grinding-disk. The grinding-disk is now` rotated by means of the pulleys and belt and the pivotcd frameS de? pressed by means of its handle, which will cause the grinding-disk to engage with the sawetooth in line therewith or sharpen the same. When the sharpening is completed,

the handle is released and the pivoted frame. is elevated byA means of the weight.- 22 audits connections. This movement of the frame 8 will also elevate or raise the arm 50, and by means of the links 47 will turn segment45 on its pivot, which will actuate the segment 46, causing the pawl 56 to move forward the extent of one tooth andthe saw to be correspondingly rotated, which will bring the next succeeding tooth into position to be. engaged by the grinding-tooth. As the pivoted frame is again depressed the pawl isreturned to. no1'- mal position. By means of the set-screws 53 the movement of segment 45 is `regulated-and the stroke of the pawl 56 lengthened or shortened, so as to move the saw a corresponding distance, so as to enable the machine to sharpen different saws the teeth of which are at different distances apart. By means of the adjusting-screws 19 the downward movement of the pivoted frame 8 is limited andthe grinding-diskprevented from making too deep a cut. It will be seen that the gate 27 is approximately triangular in shape, being pivoted to the arm 26atvthe junction of the bars 28. By loosening the screw-bolt 60 the gate can be swung on its pivot to the rightor'left, whereby the front edge of'the `tooth may be presented'to the grindingrdiskata-n angle to the perpendicular.v

In sharpening crosscut-saws where a bevel istobe given to the side of the tooth-the hubs 2li-.and 57can-be turned l'aterally'by loosening the set-screws 25 and 58, causing the'saw.

carried by the gate to be presented at-anau'- gle to the grinding-disk and thetooth be given the proper bevel.

The machine above described is-employ-ed for gumming and sharpening. circular saws When straight saws: areto be sharpened,1a horizontally-movable carriage is mounted` upon the hubs 3l (in thisinstance one being employedin each arm; 28) andis :moved for-r ward'by. the pawl 56. The construction otherwise is the same as' that aboveset forth.

Having thus described' my invention, whatI claim isl. In asaw gumming and sharpeningy maf chine, the combination, withthe upright, the rotatable hubs mounted thereon provided with set-screws, and the arm-projecting fromv the upper hub, of the gate pivotedto said arm, consisting of the inclined bars and curved connecting-arm having recesses and slots, and

IIO

diate plain portion and a collar, the cup-shaped hub tting on said spindle, having a'boss adapted to seat in the recess in the inclined bars, the cone fitting ou said spindle,.and the nuts, substantially as described.

3. In a saw gumming and sharpening machine, the combination, with the upright, ythe hubs. mounted thereon, and the pivoted'ad justable gate, of the adjustablev horizontal plate connected with said gate, thev cogged segments connected with said'plate, the'ad-- j ustable bar and feed-pawl connected with one 'of said segments, the links connected with the other segment, the frame` secured to the upchine, the combination, with the adjustable saw-carryin g gate, of the adjustable plate connected therewith, the cogged segments pivoted to said plate, the adjustable arm and feed-pawl connected with one of said segments, the set-screws for limiting the movement of the segments, and means, substantially as described, for actuating the segments.

6. In a saw gumming and sharpening machine, the combination, with the upright, the adjustable saw-carrying gate, the verticallyadjustable horizontal plate, the cogged segments pivoted to said plate, the adjustable bar connected With one of said segments and provided with a pawl, the links connected with the other segment, and the set-screws for limiting the movement of said segment, of the frame secured to said upright, the grinding-disk frame pivoted therein, and the bar connecting said frame With the links, substantially as described. v

In testimony that I claim the foregoing as my own I have hereunto aftixed my signature in presence of tWo Witnesses.

FRANCIS JAMES DRAKE.

' Witnesses: l

CHARLES WILL CRAIG, HERBERT CLEMENT PHILPOTT. 

